]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
codel: refine one condition to avoid a nul rec_inv_sqrt
authorEric Dumazet <edumazet@google.com>
Sun, 29 Jul 2012 20:52:21 +0000 (20:52 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 10 Aug 2012 23:52:54 +0000 (16:52 -0700)
commit2359a47671fc4fb0fe5e9945f76c2cb10792c0f8
tree2ff0ca201a2797f26414dcfe5df90ededb94375b
parent55461ddbcb0b36d1575e01fb4f130c609ca1cfee
codel: refine one condition to avoid a nul rec_inv_sqrt

One condition before codel_Newton_step() was not good if
we never left the dropping state for a flow. As a result
rec_inv_sqrt was 0, instead of the ~0 initial value.

codel control law was then set to a very aggressive mode, dropping
many packets before reaching 'target' and recovering from this problem.

To keep codel_vars_init() as efficient as possible, refine
the condition to make sure rec_inv_sqrt initial value is correct

Many thanks to Anton Mich for discovering the issue and suggesting
a fix.

Reported-by: Anton Mich <lp2s1h@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/codel.h